单选题The emergency signal for fires is sounded on the ship’s whistle and general alarm as（）.Aa continuous ringing for 10 secondsBone short ring followed by one long ringCtwo long rings of at least 20 secondsDa continuous ringing until the fire is extinguished
单选题
The emergency signal for fires is sounded on the ship’s whistle and general alarm as（）.
A
a continuous ringing for 10 seconds
B
one short ring followed by one long ring
C
two long rings of at least 20 seconds
D
a continuous ringing until the fire is extinguished
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